是美国股票市场的主要股票指数之一。
美国股票市场的一些现象，可以作为我们模型的例证。
Some phenomena in the US stock market are examples of our model.
在美国很多人在股票市场购买份额。
In the United States, many people buy shares in the stock market.
在美国很多人在股票市场购买份额。
In the United States, many people buy shares in the stock market.
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